CHEMISTRY HIGH SCHOOL

What does H2CO3 mean on the periodic table

Answers

Answer 1
Answer:

Answer:

Carbonic acid

Best of luck
Answer 2
Answer: Carbonic acid........

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A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as(1) an ionic compound
(2) a molecular compound
(3) a metal
(4) a nonmetal

Answers

Answer: Option (1) is the correct answer.

Explanation:

An ionic compound is the compound which is composed of oppositely charged ions.

When an ionic compound is in a solid state, then oppositely charged ions are held together by strong electrostatic force of attraction. To break is force of attraction, high energy is required. That is why, ionic compounds do not conduct electricity as a solid.

Whereas in melted state, the ions are less tightly held and as a result they can move easily  from one place to another. Also in melted state, ionic compounds act as strong electrolyte. Hence, they are able to conduct electricity.

On the other hand, molecular compounds are poor conductors of electricity and non-metals do not conduct electricity. Whereas a metal is a good conductor of electricity even in its solid state.

Thus, we can conclude that a substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as an ionic compound.
Ionic compunds are able to conduct electricity when molten/in solution, but not when they are solid

Can someone help plsCalculate the mass in grams of hydrogen chloride produced when 5.6 L of molecular hydrogen measured at STP react with an excess of molecular chlorine gas.

Answers

18.22 g of hydrogen chloride produced when 5.6 L of molecular hydrogen measured at STP react with an excess of molecular chlorine gas.

What is STP and how the amount of HCL came out to be 18.22 grams after the reaction?

  1. STP is standard temperature and pressure which is taken into account in the question to compare the value to standardized values.
  2. Here is given 5.6 L of hydrogen measured at STP reacting with an excess of chlorine gas.
  3. According to STP, T = 273 K , P= 1 atm , R = 0.0821L atm/K mol. The equation would be like: H2 + Cl2 = 2HCl .
  4. Now using ideal gas law , PV =nRT , n =PV/RT = 1 x 5.6L/0.0821Latm/K mol x 273 = 0.2498 mol.
  5. Now molar mass of HCl = 0.4996 x 36.485 = 18.22 g . Hence the amount of HCl produced would be 18.22 grams.

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After doing multiple titrations, your NaOH solution is determined to have a mean concentration value of 0.100 M. Given you are to assume your unknown acid is 75.0% KHP, how many grams of your unknown will you need to use 15.00 mL of your 0.100 M standardized NaOH

Answers

Answer: The mass of unknown acid needed is 0.230 grams

Explanation:

To calculate the number of moles for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}

Molarity of NaOH solution = 0.100 M

Volume of solution = 15.00 mL = 0.015 L    (Conversion factor:  1 L = 1000 mL)

Putting values in above equation, we get:

0.100M=\frac{\text{Moles of NaOH}}{0.015L}\n\n\text{Moles of NaOH}=(0.100mol/L* 0.015L)=0.0015mol

The chemical reaction for the reaction of KHP and NaOH follows

KHC_8H_4O_4(aq.)+NaOH\rightarrow KNaC_8H_4O_4(aq.)+H_2O(l)

By Stoichiometry of the reaction:

1 mole of NaOH reacts with 1 mole of KHP.

So, 0.0015 moles of NaOH will react with = (1)/(1)* 0.0015=0.0015mol of KHP

  • To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of KHP = 0.0015 moles

Molar mass of KHP = 204.22 g/mol

Putting values in above equation, we get:

0.0015mol=\frac{\text{Mass of KHP}}{204.22g/mol}\n\n\text{Mass of KHP}=(0.0015mol* 204.22g/mol)=0.306g

We are given:

Mass of unknown acid = 75 % of Mass of KHP

So, mass of unknown acid = (75)/(100)* 0.306=0.230g

Hence, the mass of unknown acid needed is 0.230 grams

When a rock turns into (), all the material it contains is destroyed and melted by extreme heat. For this reason, igneous rocks don’t contain any()
.

Answers

Magma, Fossils is the correct answer.

  • When a rock turns into magma all the material it contains is destroyed and melted by extreme heat.
  • For this reason, igneous rocks don't contain any fossils.
  • The term magma represents molten rocks. The heat is so much that it even melts the rocks, so any chances of preserving fossils is negligible.
  • Igneous rocks are formed after the cooling and solidification of magma. So it is obvious they can't preserve any previous information before the magma.  

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Answer: a and c

Explanation:

Discuss the relationship between the structure of hydrocarbons and their properties of polarity and solubility. How does this compare to water?

Answers

Answer:

Hydrocarbon being non polar are soluble only in non polar solvent.

Explanation:

Hydrocarbon molecules either have very little polarity or they do not have polarity at all, this is because of absence of electro-negative atoms in their molecular structure. Due to this their solubility is also affected. The solubility of a compound depends on its polarity as it can dissolve in a polar solvent only when it is polar or else they are soluble in non-polar solvent

Which of the following processes would you predict to have an increase in entropy?condensation of water



freezing water



melting ice



deposition of CO2 (changing from a gas to solid)

Answers

Among the choices given, the best answer is the third option. Melting ice shows an increase in entropy. Entropy is the degree of disorderliness in a system. Among the phases, solid has the most ordered structure which means it has the least entropy. The ice melting shows a phase change from solid to liquid. Liquid molecules are more disorganized than the solid thus there is an increase in entropy.

Answer: melting ice

Explanation:

Entropy is the measure of randomness or disorder of a system. If a system moves from  an ordered arrangement to a disordered arrangement, the entropy is said to decrease and vice versa.

1. condensation of water : Condensation process is a process where gaseous state changes to liquid state., thus decreasing randomness and decreasing entropy.

2. Freezing water : Freezing process is a process where liquid state changes to solid state, thus decreasing randomness and decreasing entropy.

3. melting ice: Fusion process is a process where solid state changes to liquid state, thus increasing randomness and increasing entropy.

4. deposition of CO_2: deposition process where gaseous state changes to solid state by escaping liquid state, thus decreasing randomness and decreasing entropy.
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